Generator to buck boost box

[Jimmy ray]

Hi all, so I'm having a difficult time sitting this generator out. Genny is fine, two legs of 120 and 240 across. Here's my issue, I'm assuming this buck box is a voltage regulator so as not to fry my inverter/charger but the power coming out of it is 98/140, 240 across. I'm not qualified to go any farther.... I'm pretty sure it's wired right my X's and h's line up with schematic. I'm stumped, any help is welcome. Thank you.
Here's the gen and transformer plaque